Re: [uievents-tests] Fix button event on mouse events. (#5710)

These tests are now available on [w3c-test.org](https://w3c-test.org/submissions/5710/)

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5710#issuecomment-297563047

Received on Wednesday, 26 April 2017 22:47:40 UTC